C743-93

1.1 This Standard applies to factory-designed and prefabricated absorption or vapour-compression refrigeration chillers equipped with centrifugal or rotary screw and positive desplacement (reciprocating or scroll) compressors. The Standard applies to chillers having a cooling capacity under 5600 kW (1590 tons) and intended for application in air-conditioning systems for buildings. 1.2 This Standard applies to absorption chillers, single-effect indirect-fired by steam or hot water; double-effect, both indirect and direct-fired*; and multiple-effect and multi-loop cycle absorption chiller/heater units. Water is the refrigerant and lithium bromide is the absorbent. *This Standard may also be used for rating gas-fired absorption chillers at the discretion of the user. 1.3 This Standard applies to hermetic and external-drive, centrifugal or rotary-screw chillers with continuous capacity modulation, whether driven by an electric motor, steam turbine, or another prime mover, such as an internal combustion engine. 1.4 This Standard applies to hermetic and external-drive positive displacement (reciprocating or scroll) compressor equipped chillers, with either self-contained or remote condensers. 1.5 This Standard applies to positive displacement compressor heat reclaim chillers. 1.6 This Standard does not apply to (a) absorption chillers with air-cooled condensers; (b) liquid chillers for use with liquids other than water; and (c) centrifugal or rotary screw heat reclaim chillers. 1.7 The values given in SI (metric) units are the standard. The values given in parentheses are in yard/pound units and are given for information only.